Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pressure Switch
Install manifold gauge set. Pressure switch is located on liquid line, at receiver-drier. Disconnect pressure switch connector. Run engine at approximately 1500 RPM. Using an ohmmeter, check for continuity between pressure switch terminals. See Fig 1. See PRESSURE SWITCH TEST table. If continuity is not as specified, replace pressure switch.
| Line Pressure psi (kg/cm2 ) | Switch Operation | Continuity | ||||
|---|---|---|---|---|---|---|
| Decreasing To 28 (2.0) (1) | On | Yes | ||||
| Increasing To 33 (2.3) (1) | Off | No | ||||
| Decreasing To 370 (26.0) (1) | Off | No | ||||
| Increasing To 455 (32.0) (1) | On | Yes | ||||
| Greater Than 199 (14.0) (2) | Off | No | ||||
| Less Than 199 (14.0) (2) | On | Yes | ||||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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